Vcore 3.1 Rear Z arm slides down under weight of bed
Just upgraded from 3.0 to 3.1 on the Z axis, with wobbleX.
As per the title the rear z arm slides down by like 15 cm.
I am unable to home properly unless I manually twist the z hold in place and then home. Then the motors get energized and I'm good.
3.0 Z design had a ANTI-BACKLASH NUT BLOCK, that you could tension to stop this from happening.
3.1 doesn't seem to have any such consideration.
Curious many others wouldn't have the same problem, yet I don't see any posts.
Am I missing something, or some part? Much appreciated
21 Replies
chech the couplers grub screw
and check if the oldham coupler is screwed in correctly
spring loaded POM nuts solved that for me
this is not normal
you should not need and not use these springs at all
this cant be the reason why it went down
thats basically impossible
you must have forget something else
I'm using the wobbleX design here. So there is only the basic POM nut.
GitHub
Interfaces-for-WobbleX-integration/RatRig/VCore3.1 at main · Mirage...
CADs and STLs that can be adapted to various 3D printers in order to benefit from the best Z wobble management system. - Interfaces-for-WobbleX-integration/RatRig/VCore3.1 at main · MirageC79/Inter...
Maybe I will have to try this
trust me, on a v-core, the ratrig oldham couplers are superior
i do also spot misaligned leadscrews
and btw, you CAN NOT use the oldhams on the wobble x arms
thats not possible
thats the reason why it went down
you need to use the original ratrig arms, where you can screw down the oldhams to the arm
you didnt do that
this is not working
you see that, there are two screws that mount the oldham to the arm
without that it will never work
i highly suggest to stick with the stock configuration for the arms
Very interesting. I thought the WobbleX was superior to the stock oldhams...
they are not
The two screws with the Radial Ball Bearing at the top I am still using. Just not the oldham couple.
So you have no z artifacts at all with the stock step with a tall print?
With input shaping on?
well, you can do whatever you want, but mixing wobble arsm and oldhams doesnt work. they are jsut incompatible
i can clearly see in your photo that you havent screwd the oldhams down
Yes they seem incompatible. I never used the stock 3.1. I just upgrded from 3.0 to 3.1, and thinking the wobbleX is superior. At least thats what I was told.
they are defintely not superior on a v-core
in fact they are worse
Oh you mean this part is not screwed down?
Yeah that defeats the purpose of the WobbleX letting the lead screw move freely. Though it does look like I now have this problem....
Oh shoot that is worse....
agree...to disagree. Agreed... should not 'need' 'Not' use? I've never seen any lead screw system that desires zero backlash, NOT use a setscrew spread or spring load nut.
Even the half nut on my lathe use a spring to set zero lash when engaging the screw (shoves the two halves in opposite directions).
For a V-core, simply relying on gravity (and hopefully no Z linear rail stiction) does not fit my sensibilities (nor decades of experience) BUT... everyone needs to follow their comfort zone.
...old joke.... if you're following me, you must be lost too! 🙂